io9 has a regular feature they call Concept Art Writing Prompts. They post a piece of art and invite readers to submit stories based upon the illustration. I've started writing short—very, very short—stories as a warm-up to my real writing. This one was based on a piece by Sandy Skoglund.
X + ? = Profit!
It had been far more successful than Dmitri had dared hope, even in his wildest dreams. Now it was just a matter of waiting until the money started rolling in.